106 Magnetic Field Effects at 3 T

There are many technical challenges associated with creating MRI systems with field strengths greater than 1.5 T. First, the magnetic field (B₀) in an MRI system can vary slightly across large imaging volumes. The measure of the extent of this variation is termed homogeneity. Highly homogenous fields are important in achieving images with consistent signal and chemical fat suppression. At higher field strengths, maintaining highly homogenous fields within and around the imaging volume requires special considerations in magnet design. New approaches in the design of the magnet hardware of an MR system can affect a wide variety of applications including body, breast, orthopedic, and neurologic applications by improving the consistency of signal intensities in the image, maintaining a consistent level of chemical fat suppression, and minimizing distortions at the edges of the images. Figure 106.1B when compared with Fig. 106.1A

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